Vacuum breaker



FIG. 1 is a perspective view of a vacuum breaker showing my new design;

FIG. 2 is a side elevational view thereof the other sides being the same as the side shown; and

FIG. 3 is a top plan view thereof.

The broken line representation of plumbing connections in FIG. 1 is for purposes of illustration only and forms no part of the claimed design. 

The ornamental design for a vacuum breaker, as shown and described. 